Door stop



FIG. 1 is a perspective view of a door stop showing our design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view;

FIG. 6 is a left side elevational view; and,

FIG. 7 is a right side elevational view.

The broken lines indicate portions of the door stop that form no part of the claimed design. 

CLAIM The ornamental design for a door stop, as shown and described. 